val dsu = (assignmentByNode.keys + assignmentByNode.values.map { it.node }).associateWithTo(mutableMapOf()) { it }

        fun get(node: ResolutionNode): ResolutionNode = when (val value = dsu.getValue(node)) {
            node -> node
            else -> get(value).also { dsu[node] = it }
        }

        fun union(left: ResolutionNode, right: ResolutionNode) {